Question

0.1 mole of a carbohydrate with empirical formula ch2o contains 1 g of hydrogen. What is its molecular formula

Answer 1

Given that number of moles of carbohydrate = 0.1 moles.

We know that 1 mole of carbohydrate contains 2n moles of H.

Then 0.1 mole of carbohydrate = 2n * 0.1 moles.

Given that molar mass of hydrogen in 0.1 moles = 1g.

So, 2n * 0.1 = 1

= > 2n = 10

= > n = 5.

Therefore, the molecular formula of the carbohydrate is (C5H10O5).

Hope this helps!

Answer 2

Answer:

Let molecular formula be (CH

2 O) n

In one mole of carbohydrate, there is 2n g of hydrogen present.

So, 0.1 mole of carbohydrate there is 2n/1×0.1 g of hydrogen which is equal to 1g

2n/1×0.1= 1

n=5

Molecular formula = C 5 H 10 O 5

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Hope it helps u